4-Stroke dissasembly - RCCanada - Canada Radio Controlled Hobby Forum
RCCanada - Canada's Radio Control Hobby Forum
Engines Discuss engines

Closed Thread
Thread Tools Display Modes
Old 02-07-2010, 08:50 PM   #1
RCC Contributor
Cdallas2's Avatar
I am: Chris D
Join Date: Jan 2003
Location: Kamloops B.C.

Feedback: 2 / 100%
Posts: 454
Total Props: 0
4-Stroke dissasembly

       Remove this ad - become a site supporter!
I'm pulling apart an older but barely used OS .48 Surpass to check and probably replace the bearings.

I've run into a problem in that I can't get the wrist-pin out. I've removed the sleeve and taken the plastic button out but I can't seem to get it.

Any ideas?
Chris Dallas MAAC#41367

Are you suggesting coconuts migrate?
Cdallas2 is offline   Quick reply to this message.

Sponsored Links - Subscribe to remove this ad.
Old 02-08-2010, 08:33 AM   #2
RCC Supreme Contributor
kip51035's Avatar
I am: Cliff S
Join Date: Feb 2007
Location: Belleville Ont.
Radio of choice:
Hitec, Futaba - FM
# of RCs: 10

Feedback: 25 / 96%
Posts: 2,757
Total Props: 13
Re: 4-Stroke dissasembly

I use this: It is a piece of 1/16" piano wire, bent over at a 90 deg angle over something with a sharp corner. Grind the 90 deg. piece really short so the unit will fit in the wrist pin. You will end up with a very small lip. Use this to grab the far side of the pin and pull gently. The other method is to grind down a piece of doweling so it is a bit too big for the inside of the pin and tap it into the pin. Then rotate and pull gently. If there is an excessive build up of carbon, try heating the assembly over the toaster or stove until it is too hot to touch. The piston will expand a little more than the pin and make it easier to remove. With many engines with the sleeve removed the con rod will pull off the crank if you make sure the top of the con rod has moved in the same direction.


Last edited by kip51035; 02-08-2010 at 08:36 AM.
kip51035 is offline   Quick reply to this message.
Old 02-08-2010, 09:34 AM   #3
E Smith
RCC Contributor
Join Date: Dec 2009
Location: Brantford, ON.

Feedback: 0 / 0%
Posts: 284
Total Props: 0
Re: 4-Stroke dissasembly

If all else fails you may have to use a "Stud Extractor" commonly called "Easy outs" They are available from industrial suppliers or a friend who performs his own engine work.

Ed S
R/C Pylon Racing. When Sex, Drugs and Booze just does not do it!
E Smith is offline   Quick reply to this message.
Old 02-09-2010, 05:35 AM   #4
RCC Senior Contributor
I am: Romeo R
Join Date: Dec 2004
Location: toronto
Radio of choice:
# of RCs: 10

Feedback: 42 / 100%
Posts: 687
Total Props: 3
Re: 4-Stroke dissasembly

i disassembled a 120 os last week and i encountered the same problem, i heated the piston from the bottom through the back plate, by heat gun as Kip said you have to make a fine hook, to fish it out,it should work. watch for the marking on the cam when you remove it.

maac #38176
sport flyer
rome is offline   Quick reply to this message.
Closed Thread

Quick Reply

Register Now

In order to be able to post messages on the RCCanada - Canada Radio Controlled Hobby Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

Member names may only be composed of alpha-numeric characters. (A-Z and 0-9)

!!ATTENTION ADVERTISERS!! If you intend on advertising anything on this forum, whatsoever, you are required to first contact us here . Additionally, we do NOT allow BUSINESS NAMES unless you are an Authorized Vendor. If you own a business, and want to do sales on this site via posting or private message, you will need to follow the rules. Shops, Stores, Distributors, Group Buys without being authorized will see your account terminated.
User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:
Your Name
Your first name and last initial is required if you plan on using the forum.
Which city & province you live in. This is mandatory for classified listings.
Radio of choice?
Which radio is your current favorite to use?
Number of RC Vehicles?
How many boats, cars, planes do you own?


Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
vBulletin Message

Thread Tools
Display Modes

Forum Jump

All times are GMT -5. The time now is 02:04 AM.

vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2016 DragonByte Technologies Ltd.